Cited by 85Mitochondrial Function and PathologyATP Synthase and ATPases ResearchMetabolism, Diabetes, and Cancer

Regulation of respiration in brain mitochondria and synaptosomes: restrictions of ADP diffusion in situ, roles of tubulin, and mitochondrial creatine kinase

Monge, Claire, Beraud, Nathalie, Kuznetsov, Andrey V., Rostovtseva, Tatiana, Sackett, Dan, Schlattner, Uwe, Vendelin, Marko, Saks, Valdur A.·2008·Molecular and Cellular Biochemistry

Abstract

The role of ubiquitous mitochondrial creatine kinase (uMtCK) reaction in regulation of mitochondrial respiration was studied in purified preparations of rat brain synaptosomes and mitochondria. In permeabilized synaptosomes, apparent Km for exogenous ADP, Km (ADP), in regulation of respiration in situ was rather high (110 +/- 11 microM) in comparison with isolated brain mitochondria (9 +/- 1 microM). This apparent Km for ADP observed in isolated mitochondria in vitro dramatically increased to 169 +/- 52 microM after their incubation with 1 muM of dimeric tubulin showing that in rat brain, particularly in synaptosomes, mitochondrial outer membrane permeability for ADP, and ATP may be restricted by tubulin binding to voltage dependent anion channel (VDAC). On the other hand, in synaptosomes apparent Km (ADP) decreased to 25 +/- 1 microM in the presence of 20 mM creatine. To fully understand this effect of creatine on kinetics of respiration regulation, complete kinetic analysis of uMtCK reaction in isolated brain mitochondria was carried out. This showed that oxidative phosphorylation specifically altered only the dissociation constants for MgATP, by decreasing that from ternary complex MtCK.Cr.MgATP (K (a)) from 0.13 +/- 0.02 to 0.018 +/- 0.007 mM and that from binary complex MtCK.MgATP (K (ia)) from 1.1 +/- 0.29 mM to 0.17 +/- 0.07 mM. Apparent decrease of dissociation constants for MgATP reflects effective cycling of ATP and ADP between uMtCK and adenine nucleotide translocase (ANT). These results emphasize important role and various pathophysiological implications of the phosphocreatine-creatine kinase system in energy transfer in brain cells, including synaptosomes.

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Crossref · 10.1007/s11010-008-9865-7

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Authors
Monge, C., Beraud, N., Kuznetsov, A. V., Rostovtseva, T., Sackett, D., Schlattner, U., Vendelin, M., & Saks, V. A.
Affiliations
  • Université Joseph Fourier (FR)
  • National Institutes of Health (US)
  • Tallinn University of Technology (EE)
Corresponding author
Saks, Valdur A.
Venue
Molecular and Cellular Biochemistry
Published
2008-07-16
Volume
318
Issue
1-2
Pages
147-165
ISSN
  • 0300-8177 (ISSN-L)
  • 1573-4919
OpenAlex
W2015492989
Cited by
85
References
92
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 3 · 2022: 8 · 2021: 3 · 2020: 5 · 2019: 2 · 2018: 4 · 2017: 3 · 2016: 4 · 2015: 4 · 2014: 6 · 2013: 8 · 2012: 6
FWCI
3.55
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular and Cellular Biochemistry (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Funders
  • Institut National de la Santé et de la Recherche Médicale
  • Eesti Teadusfondi
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › ATP Synthase and ATPases Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
mitochondrial creatine kinase, brain mitochondria, synaptosomes, tubulin, voltage-dependent anion channel, mitochondrial outer membrane permeability, creatine, adenine nucleotide translocase, oxidative phosphorylation, energy transfer
MeSH terms
Mitochondrial ADP, ATP Translocases, Adenosine Diphosphate, Animals, Brain, Creatine, Diffusion, Electron Transport, Energy Metabolism, Isoenzymes, Kinetics, Male, Mitochondria, Mitochondria, Heart, Permeability, Synaptosomes, Tissue Extracts, Tubulin, Rats, Wistar, Microscopy, Confocal, Cell Respiration, Rats, Creatine Kinase, Mitochondrial Form

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